From the course: Introduction to Lights in V-Ray Next

Gamma and unit settings

- [Instructor] If you are working with your copy of 3ds Max set up in a non-default way, then it is possible that you could encounter this gamma mismatch warning as you work with the provided scene files for the course, the dialogue being Max's way of telling us that the gamma settings saved in the file are different than those currently at work inside the application. To make certain that what you see in 3ds Max as you work with the scenes matches the visual presentation found in these videos, which have all been created using 3ds Max's default camera options, all you need do each time you encounter the dialogue is select the adopt the file's gamma and LUT settings option and all will be well. If you accidentally select the wrong option, no need to panic, as switching the gamma settings inside 3ds Max is a straightforward process. All we do is come to the Customize menu, select the Preferences option, and then in the gamma and LUT tab of the dialogue, set gamma to be enabled, make sure the gamma value is set at 2.2 and also ensure that both boxes in the materials and color section are checked. Another warning that we could run into is one connected to our system and display units setup. As a general rule, we typically model our scenes to scale using the metric system, specifically in the case of this course, centimeters. If you have 3ds Max setup to use its unit defaults, then you will run into this error as you open the provided scene files. The fix again is simple in that all we need do is choose the adopt the file's unit scale option. Now, unlike gamma, the consequences of making the wrong choice here can be a bit more significant given that choosing the rescale objects option can oftentimes lead to some fairly serious scene anomalies.

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